Toxicology tests show that Amy Winehouse did not have illegal drugs in her system when she died, her family said Tuesday.
Alcohol was present, but officials have not determined if it played a role in the singer's death.
Winehouse was found dead in her London home on July 23 at the age of 27. The cause of death had been treated as "unexplained," and police previously said speculation that she died from a drug overdose was "inappropriate."
Winehouse had struggled publicly with drug and alcohol abuse. Throughout the past few years, Winehouse appeared drunk at concerts, engaged in violent club confrontations and gradually lost weight. She left rehab earlier last month for alcohol addiction, a week after checking herself in.
The singer shot to fame with her 2006 album, "Back to Black," which earned her five Grammy Awards, including record and song of the year for "Rehab."